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Source text - EnglishMany studies showed that some properties of ZnO could be promoted after integrating metal ions into its matrix. For example, La-doped or Ce-doped ZnO nanoparticles owned better photocatalytic activities than pure ZnO [17]. However, to obtain doped ZnO nanoparticles a two-step synthetic route is usually needed. Then, Can doped ZnO be obtained by a simple one-step route? In 2007, we successfully prepared ZnO nanoparticles via a simple solution-combustion route, using metal acetate as the original material and mixed alcohol as the solvent [18]. Since reactions can occur under mild conditions and only produce metal oxide, CO2 and water, the above solution-combustion method is friendly environment. Recently, some metal ions could be conveniently integrated into TiO2 nanoparticles in one step by the above solution-combustion method [19]. The above experiments indicate that it is probable to prepare doped ZnO nanoparticles in one step.

Source text - EnglishDefendants' explanation of the IQ difference, that it is caused by socio-economic factors, which interfere with the development of intellectual skills, is consistent with other circumstances not accounted for by plaintiffs' theory of cultural bias. It is uncontradicted that most of the children in the EMH classes do in fact come from the poverty pockets of the city. This tends to suggest that what is involved is not simply race but something associated with poverty. It is also significant that many black children who take the tests score at levels high enough to preclude EMH placement. Plaintiffs have not explained why the alleged cultural bias of the tests did not result in EMH level scores for these children. Plaintiffs' theory of cultural bias simply ignores the fact that black children perform differently from each other on the tests. It also fails to explain the fact that some black children perform better than most whites. Nationally, 15 to 20 per cent of the blacks who take the tests score above the white mean of 100.